No. See below – it is a non-essential variable that must be addressed on the WPS but to change it does not require a new procedure qualification.
QW-402.4 The deletion of the backing in single‐
welded groove welds. Double‐welded groove welds are
considered welding with backing.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of A.y
Sent: Wednesday, March 13, 2019 3:36 AM
To: Materials & Welding
Subject: [MW:29263] wps
addition backing in smaw process for wps is a essential Variables?
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